ST. LAWRENCE RIVER BASIN
04296500 CLYDE RIVER AT NEWPORT, VT
LOCATION.--Lat 44°56'22", long 72°ll'23", Orleans County, Hydrologic Unit 01110000, on right bank, in Newport, just
downstream from small right-bank tributary, and l mi upstream from mouth.
DRAINAGE AREA.--142 mi².
PERIOD OF RECORD.--Discharge records: May 1909 to September 1919; May 1920 to August 1922, October 1922 to
September 1924, November 1928 to May 1936, September 1938 to current year. Prior to November 1928, published as
"at West Derby."
Water-quality records: Water years 1975-77.
REVISED RECORDS.--WSP 744: 1913(M), drainage area. WSP 924: 1940. WSP 1307: 1913-15(M).
GAGE.--Water-stage recorder. Datum of gage is 682.36 ft above sea level. May 25, 1909, to September 20, 1915,
nonrecording gage, and September 21, 1915, to September 30, 1924, November 16, 1928, to May 4, 1936, water-stage
recorder, at site 0.65 mi upstream at different datum. March 6, 1957, to May 11, 1994, water-stage recorder and
records of power generation.
REMARKS.--Records good except those for estimated daily discharges, which are fair. Flow regulated by powerplant and
reservoirs upstream. No instantaneous peak stage or discharge available for period of March 6, 1957 to May 11, 1994
due to diversion of flow around station through canal and penstock of Newport No. 11 powerplant.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 3,900 ft³/s, March 20, 1936, gage height, 5.76 ft, site and datum
then in use; maximum daily, 3,610 ft³/s, March 20, 1936; minimum daily discharge, 2.6 ft³/s, June 18, 1956.
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 923 ft³/s, April 9, gage height, 5.91 ft; minimum daily discharge,
50 ft³/s, October 1, 2, 6-8.
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 50 114 168 219 129 354 409 727 249 155 94 279
2 50 96 403 199 170 353 426 750 207 79 80 235
3 51 128 462 244 118 409 435 766 269 88 78 209
4 51 118 599 262 e96 384 443 780 224 92 75 209
5 51 84 777 264 96 369 444 740 196 90 72 270
6 50 71 703 265 142 369 452 694 174 124 72 239
7 50 71 616 300 161 354 469 790 93 161 71 164
8 50 130 533 276 170 284 760 777 154 180 70 157
9 52 186 502 201 e165 280 910 766 169 206 70 156
10 52 174 441 230 115 208 868 767 166 282 70 157
11 51 153 435 280 96 205 768 747 137 216 71 157
12 51 151 413 280 96 206 701 718 96 192 70 157
13 109 185 300 249 e96 225 654 695 96 192 74 145
14 86 185 282 201 e122 271 611 651 157 232 134 95
15 86 234 281 201 e165 227 565 609 135 383 106 162
16 86 227 281 253 164 206 525 570 90 395 90 112
17 86 189 229 242 e100 e185 514 538 139 387 126 151
18 83 156 240 216 98 e155 518 515 163 403 161 118
19 77 114 279 e214 170 e150 575 501 163 406 194 99
20 71 123 334 163 201 168 628 496 112 406 209 102
21 75 155 348 163 200 169 667 487 87 250 196 100
22 79 132 319 163 204 169 691 479 98 198 305 99
23 159 104 300 165 310 169 702 464 180 187 397 144
24 186 154 283 e160 413 169 702 459 189 201 396 144
25 186 154 340 164 431 169 693 455 178 288 399 163
26 186 161 342 163 421 170 684 445 98 243 401 117
27 186 111 346 122 369 169 655 384 80 101 390 161
28 188 91 344 120 370 170 653 317 80 161 314 125
29 187 92 350 162 --- 176 692 298 79 120 295 96
30 164 147 350 e160 --- 333 717 299 94 95 207 117
31 153 --- 321 121 --- 343 --- 298 --- 95 195 ---
TOTAL 3042 4190 11921 6422 5388 7568 18531 17982 4352 6608 5482 4639
MEAN 98.1 140 385 207 192 244 618 580 145 213 177 155
MAX 188 234 777 300 431 409 910 790 269 406 401 279
MIN 50 71 168 120 96 150 409 298 79 79 70 95
CFSM .69 .98 2.71 1.46 1.36 1.72 4.35 4.08 1.02 1.50 1.25 1.09
IN. .80 1.10 3.12 1.68 1.41 1.98 4.85 4.71 1.14 1.73 1.44 1.22
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1909-24, 28-36, 38-97, BY WATER YEAR (WY)
MEAN 179 233 222 182 159 279 690 500 241 148 129 129
MAX 576 560 599 370 477 1136 1192 1042 545 464 369 523
(WY) 1946 1919 1984 1996 1981 1936 1933 1972 1978 1973 1976 1924
MIN 50.7 79.5 80.4 62.9 19.1 72.8 186 179 74.0 47.2 39.6 41.9
(WY) 1962 1923 1923 1948 1979 1911 1979 1941 1988 1991 1909 1984
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1909-24, 28-36, 38-97
ANNUAL TOTAL 119206 96125
ANNUAL MEAN 326 263 256
HIGHEST ANNUAL MEAN 394 1974
LOWEST ANNUAL MEAN 153 1979
HIGHEST DAILY MEAN 1830 Apr 25 910 Apr 9 3610 Mar 20 1936
LOWEST DAILY MEAN 50 Sep 27 a 50 Oct 1 2.6 Jun 18 1956
ANNUAL SEVEN-DAY MINIMUM 50 Sep 30 50 Oct 1 14 Oct 9 1961
INSTANTANEOUS PEAK FLOW 923 Apr 9 bc 3900 Mar 20 1936
INSTANTANEOUS PEAK STAGE 5.91 Apr 9 bc 5.76 Mar 20 1936
ANNUAL RUNOFF (CFSM) 2.29 1.85 1.80
ANNUAL RUNOFF (INCHES) 31.23 25.18 24.51
10 PERCENT EXCEEDS 670 603 529
50 PERCENT EXCEEDS 244 188 180
90 PERCENT EXCEEDS 63 85 63
a Also occurred October 2, 6-8.
b No instantaneous peak stage or discharge available for period of March 6, 1957 to May 11, 1994.
c Site and datum then in use.
e Estimated.
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